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<div id="correct">
 <div class="one two three">
  <div class="four five">
  </div>
  <div class="six seven content">
   <div>
   </div>
   Blah
  </div>
 </div>
</div>
<div id="missing-class">
 <div class="one two three">
  <div class="five">
  </div>
  <div class="six seven content">
   <div>
   </div>
   Blah
  </div>
 </div>
</div>
<div id="extra-class">
 <div class="one two three">
  <div class="four five five-point-five">
  </div>
  <div class="six seven content">
   <div>
   </div>
   Blah
  </div>
 </div>
</div>
<div id="missing-child">
 <div class="one two three">
  <div class="six seven content">
   <div>
   </div>
   Blah
  </div>
 </div>
</div>
<div id="extra-child">
 <div class="one two three">
  <div class="four five">
   <div class="five-point-five">
   </div>
  </div>
  <div class="six seven content">
   <div>
   </div>
   Blah
  </div>
 </div>
</div>